public class Computer {
    public  void openComputer(){
        System.out.println("打开电脑");
    }
    public  void closeComputer(){
        System.out.println("关闭电脑");
    }
    public void UseDevice(USB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse= (Mouse) usb;
            mouse.play();
        } else if (usb instanceof Playboard) {
            Playboard playboard=(Playboard)usb;
            playboard.playWrite();
        }
        usb.closeDevise();
    }
}
